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이우철,사공석진,Lee, Woo-Cheol,SaKong, Sug-Chin 대한전자공학회 2005 電子工學會論文誌 IE (Industry electronics) Vol.42 No.3
The 24 channel meridian electric-potential measuring System consists of a main cpu module, bio-signal analog module, interface module, power module, personal computer. The graphic user interface program conveniently allows user to setup, calibrate, measure, store, and control the meridian electric-potential measuring system. This system and program will continually be evolved using a database of clinically correlated meridian electric-potential. A variety of system configurations gives it the ability to make a user-favorable environment for measuring. 개발된 24 채널 경락 전위측정 시스템의 구성은 마이컴 제어부, 생체신호 아날로그 증폭부, 인터페이스부, 전원장치, personal computer 등 이다. 사용자 인터페이스 프로그램은 이용자를 편리하게 구성하였으며, 측정의 편리성으로 calibration기능 및 자료의 저장 과 검색 기능을 하게 하였다. 경락 전위를 측정하기 위한 프로그램을 구성하여 제어 할 수 있게 하였다. 측정된 생체 전기 신호 자료의 분석을 통하여 각각의 위치에 대한 전위의 상호 분포를 비교하여 결과를 체계적으로 나타낼 수 있게 프로그램 처리 하였다. 다양한 종류의 측정 조건을 변화 할 수 있게 구성하여 경락 전위를 측정을 위한 이용자에게 유리한 측정 환경이 되게 하였다.
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효율적인 상품평 분석을 위한 어휘 통계 정보 기반 평가 항목 추출 시스템
이우철,이현아,이공주,Lee, Woo-Chul,Lee, Hyun-Ah,Lee, Kong-Joo 한국정보처리학회 2009 정보처리학회논문지B Vol.16 No.6
본 논문에서는 상품평의 효율적인 분석을 위한 평가 항목 추출 시스템을 제안한다. 시스템은 크게 상품평 수집-보정과 평가 항목 추출의 두 단계로 구성된다. 상품평 수집-보정에서는 인터넷 쇼핑몰에서 상품평을 수집하고 상품평 특유의 구어체 표현과 맞춤법 오류 등을 처리한다. 평가 항목 추출에서는 스커트 상품 카테고리의 경우 ‘사이즈', ‘스타일'과 같이 상품을 평가하는 기준이 되는 항목을 상품평과 인터넷 상의 웹 문서를 활용하여 자동으로 추출한다. 상품평에 나타나는 명사들을 평가 항목 후보로 설정하고, 각 후보 명사의 상품평에서의 어휘 통계인 내부연관도와, 후보 명사와 상품 카테고리명의 웹 문서에서의 공기 빈도에 기반하여 계산된 외부연관도를 결합하여 상품과 평가 항목 후보의 연관도를 계산한다. 본 논문의 평가 항목 추출 방식은 평균 재현율 90%를 보여 기존 연구보다 우수한 결과를 보였다. In this paper, we introduce an automatic product feature extracting system that improves the efficiency of product review analysis. Our system consists of 2 parts: a review collection and correction part and a product feature extraction part. The former part collects reviews from internet shopping malls and revises spoken style or ungrammatical sentences. In the latter part, product features that mean items that can be used as evaluation criteria like 'size' and 'style' for a skirt are automatically extracted by utilizing term statistics in reviews and web documents on the Internet. We choose nouns in reviews as candidates for product features, and calculate degree of association between candidate nouns and products by combining inner association degree and outer association degree. Inner association degree is calculated from noun frequency in reviews and outer association degree is calculated from co-occurrence frequency of a candidate noun and a product name in web documents. In evaluation results, our extraction method showed an average recall of 90%, which is better than the results of previous approaches.
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The Analysis of Gas Productivity by the Influence of Condensate Bank near Well
이우철,성원모,이계정,한정민,이영수 한국자원공학회 2011 Geosystem engineering Vol.14 No.3
While producing gas from the reservoir to the surface,there exists a unavoidable pressure drop near the wellbore. Due to excessive pressure drops, a condensate drops out from gas and flows with gas towards a well because of compositional changes in PVT phase behavior. Since these all make a productivity of reservoir worse and reduce an overall recovery,many studies of condensate bank phenomena have been performed for a long time. In this study, a reservoir simulation has been conducted to investigate the effect of well's productivity due to the behavior of condensate bank near well. Also this study presents the effects of heterogeneity on condensate banking and conformance control methods to minimize condensate bank problems effectively. From simulational results of condensate bank phenomena in a gas-condensate reservoir, the condensate forms rapidly in the vicinity of the well as soon as gas production begins since the bottom-hole pressure is much lower than the dew-point pressure. The accumulated condensate causes a blockage effect on the movement of reservoir fluids and reduce the effective permeability to gas appreciably,and also causes the decline of well's productivity. The trend of producing GOR shows the abrupt changes which represents typical complex behaviors of gas-condensate reservoirs. In a very heterogeneous reservoir, the bank radius expands up to 100 ft in a day and the maximum saturation of condensate reaches 0.61. Therefore, the mobility of gas is dropped and the overall recovery of oil and gas is decreased. While oil saturation has a highest value near the well in general, in case of reservoir with a strong heterogeneity, some regions away from the wellbore show high level of oil saturation according to local distributions of permeability. To increase the productivity, a different producing strategy was conducted by changing the manner in which the well is brought into flowing condition. The maximum gas and oil production can be achieved by lowering the BHP slowly in the first step of operation period instead of dropping the BHP quickly. The large pressure drops from the beginning of operation makes the formation of condensate bank earlier and increases the producing GOR due to the growth of condensate bank. Accordingly, the implementation of optimal production strategy is essential by considering the condensate content, technical factors, economics depending on market price as well as gas and condensate production profiles in long term.
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이우철,김정래 大韓醫用生體工學會 1998 대한의용생체공학춘계학술대회논문집 Vol.20 No.1
To investigate Medical Instrument on the 400-600 Bed of General Hospital. Medical equipment presented appropriate level. We investigate quality and item of medical equipment with subject on the Twenty-four of Medical office. So Medical equipment appear difference of possess ion present condition an each Hospital. We will he estimate proper medical equipment with quality if Mean value than the common medical equipment on consisting of basic item. This hospital purchase administration have advantage by the medical market. The result has valuable and helpful of 400-600 Bed of General Hospital for Hospital administration operation, hospital policy and planning.
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流線解析法을 利用한 射出金型의 피이드·씨스템 設計에 對한 硏究
李愚哲 서울産業大學校 1986 논문집 Vol.24 No.1
In a mould the hot melt is conveyed to individual impression through the feed system. It feeds by a gate which is simply a restriction in the flow path. Runner and gate design represents a compromise of many factors. The runner must be large enough too facilitate rapid filling of the impression but not so large as to significantly increase the time required to freeze the material in the runner. One of the most important factors of runner and gate design is balancing to ensure that each impression fills at the same rate. Therefore, It was studied by analyze the flow motion in the feed system of the injection mould. The cross-sectional shape of the runner in a mould is assumed as fully round. Flow of a melted resine as liquid through a contraction (Gate) between upstream and downstream regions of fully developed laminar flow has been studied by combining a graphical and streamline analysis method.
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